Patents by Inventor Sadayuki Uchida

Sadayuki Uchida has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).

  • Sizing agent composite for papermaking
    Patent number: 5399660
    Abstract: The invention provides a sizing agent with good stability, particularly which is rapid in getting started in the neutral zone and a method of producing the same.A sizing agent for papermaking in neutral zone is characterized by a main component of said sizing agent being selected from the group consisting of a diester of rosin-based substances having a dicarboxylic acid or acid anhydride group expressed by the following formula (I), ##STR1## (in which R.sub.1 represents a rosin acid residue or maleopimaric acid, R.sub.2 represents a dihydric alcohol residue and R.sub.3 represents a maleopimaric acid residue); and 2) a polyester reaction product expressed by the following formula (I'), ##STR2## (in which R'.sub.1 and R'.sub.5 represent a rosin acid residue or an .alpha.,.beta.-unsaturated polybasic carboxylic acid added rosin residue, at least one of them represents .alpha.,.beta.-unsaturated polybasic carboxylic acid added rosin residue, R'.sub.2 and R'.sub.4 represent polyhydric alcohol residues, R'.sub.
    Type: Grant
    Filed: April 30, 1993
    Date of Patent: March 21, 1995
    Assignee: Harima Chemicals, Inc.
    Inventors: Sadayuki Uchida, Tomohiko Nakata, Yoshihide Ishikawa, Masao Hamada, Shinichi Kimura, Satoru Iwasa